JPH11239529A - Plastic mirror - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dissolve distortions of a mirror image due to deformations of an outer peripheral frame part at the time of attachment. SOLUTION: A base body 10 made of resin is composed by integrally molding a center plate 11 and an outer peripheral frame 12 formed at the outer peripheral edge of the center plate 11 by injection molding. On one surface of the center plate 10, a film mirror 20 made of the resin is joined. The outer peripheral frame 12 is provided with an annular projection 13 integrally projected to the back side of this plastic mirror more than the other surface of the center plate 11 and is thickened by a prescribed amount more than the center plate 10. By the increase of the rigidity of the outer peripheral frame 12 to be an attaching part an attaching surface, even in the case of enlarging the plastic mirror, distortion of the center plate 10 and the film mirror 20 made of the resin and distortion of a mirror image further due to the deformation of the outer peripheral frame 12 at the time of the attachment are effectively suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic mirror, and more particularly, to a plastic mirror comprising a resin substrate formed by injection molding and a resin film mirror joined on one surface of the resin substrate.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 6, a plastic mirror composed of a resin base 80 formed by injection molding and a resin film mirror 90 joined on one surface of the resin base 80 is provided. Known (Japanese Unexamined Patent Publication No.
See 244901, JP-A-54-89864, and the like. ).

Here, a resin base 80 includes a central plate portion 81 to which a resin film mirror 90 is joined on one surface,
An outer peripheral frame 82 is formed integrally with the outer peripheral edge of the central plate 81. The resin film mirror 90 is
A transparent thermoplastic resin film such as polycarbonate,
A metal reflective film of silver, aluminum or the like formed on the back surface of the thermoplastic resin film, and an adhesive primer layer of an acrylate resin or the like formed on the surface of the metal reflective film on the joint surface with the central plate portion, A hard coat layer and the like formed on the outer surface of the thermoplastic resin film as required.

This plastic mirror can be manufactured by integrally molding a resin base 80 comprising a central plate portion 81 and an outer peripheral frame portion 82 while inserting a resin film mirror 90 into a mold. The plastic mirror is attached by attaching an adhesive 83 or the like to the back surface of the outer peripheral frame portion 82 of the resin base body 80 and then pressing the back surface of the outer peripheral frame portion 82 against a mounting surface such as the inner wall surface of a house. It can be carried out.

[0005]

Here, when a plastic mirror and a glass mirror are compared, the plastic mirror is lightweight and hard to be broken, and has a high degree of freedom in shape and color.
While it has advantages such as high productivity, it has a fundamental disadvantage that distortion is likely to occur because the rigidity is extremely low as compared with a glass mirror.

For this reason, in the above-mentioned conventional plastic mirror, the outer peripheral frame portion 82 of the resin base 80 is deformed when it is mounted on the mounting surface with an adhesive or the like. There is a problem that the mirror image is distorted and distorted. That is, in the above-mentioned conventional plastic mirror, a device such as increasing the rigidity or improving the strength of the outer peripheral frame portion 81 of the resin base body 80 to which an adhesive or the like is applied and pressed against the mounting surface is particularly made. However, the thickness (rigidity) of the outer peripheral frame portion 81 and the other portions (the resin film mirror 90 and the central plate portion 81) are substantially equal. Therefore, when pressed against the mounting surface, the outer peripheral frame portion 81 is easily deformed under the influence of unevenness of the wall surface and unevenness of the thickness of the adhesive layer, and the above-mentioned problem of distortion of the mirror image is likely to occur. In particular, when the size of the plastic mirror is increased (increased in area), the ratio of the resin film mirror 90 to the outer peripheral frame portion 81 increases, so that the problem of the mirror image distortion becomes significant.

The present invention has been made in view of the above circumstances, and solves the problem of distortion of a mirror image due to deformation of an outer peripheral frame portion at the time of mounting even when a plastic mirror is enlarged. It is an object of the present invention to provide a plastic mirror.

[0008]

According to a first aspect of the present invention, there is provided a plastic mirror made of a resin in which a central plate portion and an outer peripheral frame formed on an outer peripheral edge of the central plate portion are integrally formed by injection molding. In a plastic mirror having a base and a resin film mirror bonded to one surface of the central plate, the outer peripheral frame is integrally formed on the back side of the plastic mirror with respect to the other surface of the central plate. It is characterized by having an annular protruding portion that protrudes.

This plastic mirror is mounted and used by abutting and fixing an annular projection of an outer peripheral frame portion to a mounting surface such as an inner wall surface of a house. The fixing of the outer peripheral frame portion and the mounting surface can be performed, for example, by applying an adhesive or the like to a contact surface between the annular protrusion and the mounting surface. Also,
It is also possible to use bolts and nuts as shown in the embodiments described later.

In the plastic mirror according to the present invention, a portion which comes into contact with a mounting surface such as an inner wall surface and is provided with a pressing force at the time of mounting, that is, an outer peripheral frame portion protrudes rearward of the plastic mirror from the center plate portion. Part. For this reason, the thickness of the outer peripheral frame portion in the front and back direction of the plastic mirror (vertical direction in FIG. 1; the same applies hereinafter) is made thicker by the thickness of the annular projection than the thickness of the central plate portion. The rigidity of the outer peripheral frame portion is increased by the amount of the movement. Therefore, the outer peripheral frame portion has a structure that is hardly deformed by the influence of unevenness of the mounting surface or a variation in the thickness of the adhesive, and is hardly deformed even when pressed with excessive force when mounting the plastic mirror. I have.

Moreover, since the annular protrusion projects from the back side of the plastic mirror, even if the annular protrusion is slightly deformed due to the pressing force at the time of mounting or the unevenness of the mounting surface, etc.
The structure has such a structure that the influence of the deformation of the annular projection hardly reaches the central plate portion and the resin film mirror. That is, if the rear surface of the plastic mirror is flush with the central plate portion and the outer peripheral frame portion, if the outer peripheral frame portion is deformed due to the influence of the unevenness of the mounting surface, the influence of the deformation of the outer peripheral frame portion is obtained. Is directly extended to the central plate portion, so that the central plate portion is easily deformed. However, in the present invention, since the annular projection projects from the back side of the plastic mirror, even if the annular projection is deformed under the influence of the unevenness of the mounting surface, the deformation is absorbed inside the annular frame. This can reduce the effect on the center plate.

Therefore, even when the size of the plastic mirror is increased, it is effective to prevent the center plate and the resin film mirror from being distorted due to the deformation of the outer peripheral frame at the time of mounting, and hence the mirror image from being distorted. Can be suppressed. (2) The plastic mirror according to the second aspect is the first aspect.
In the plastic mirror described above, the width of the annular projection is equal to or greater than the thickness of the central plate.

Here, the width of the annular projection is defined as the width direction of the outer peripheral frame portion (perpendicular to the front and back directions of the plastic mirror and perpendicular to the direction in which the outer peripheral frame portion extends in the circumferential direction). In other words, that is, the left-right direction of the outer peripheral frame portion shown in FIG. In this plastic mirror, the width of the annular projection is equal to or greater than the thickness of the central plate (the thickness in the front and back directions of the plastic mirror), and exhibits a predetermined or higher rigidity. Therefore, it is possible to more effectively suppress distortion of the central plate portion and the resin film mirror due to deformation of the outer peripheral frame portion, and furthermore, distortion of the mirror image. (3) The plastic mirror according to the third aspect is the first aspect.
3. The plastic mirror according to claim 2, wherein the annular protrusion has a hollow portion.

When the annular protrusion is formed integrally with the outer peripheral frame and the like by injection molding, there is a certain molding limit in the width of the annular protrusion from the viewpoint of the flowability and cooling property of the molten resin. In this regard, in this plastic mirror, since the annular protrusion has the hollow portion, the width of the outer shape of the annular protrusion is equal to the width of the hollow portion in the width direction of the outer peripheral frame portion. Can be increased, and the rigidity of the annular projection can be increased. Therefore, it is possible to further effectively prevent the center plate and the resin film mirror from being distorted due to the deformation of the outer peripheral frame, and furthermore, the mirror image from being distorted. (4) The plastic mirror according to the fourth aspect is the first aspect.
In the plastic mirror described above, the outer peripheral frame portion is
An outer peripheral portion of the resin film mirror has an annular covering portion for covering an outer surface of the resin film mirror.

In this plastic mirror, since the outer surface of the outer peripheral edge of the resin-made film mirror is covered by the annular covering portion of the outer peripheral frame, the outer peripheral edge of the resin-made film mirror and the outer peripheral frame are separated from each other. It is possible to regulate the intrusion of moisture and the like, and it is possible to effectively prevent the deterioration of the resin film mirror.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The plastic mirror of the present invention
A resin base and a resin film mirror are provided.
The resin film mirror is a transparent resin film, a metal reflection film formed on the back surface of the resin film, and an adhesive primer layer formed on the surface of the metal reflection film on the bonding surface with the resin substrate, It is composed of a hard coat film formed on the outer surface of the resin film, a functional film such as an antifogging film, an antireflection film and an antistatic film as required.

The type of resin of the resin film is as follows.
It is not particularly limited as long as it is transparent, and in consideration of the heat-fusing property with a resin base and the characteristics required as a product (mechanical strength, impact resistance, heat resistance, chemical resistance, and the like), It can be selected as appropriate. For example, it can be appropriately selected from polycarbonate (PC), polymethyl methacrylate (PMMA), polyethylene terephthalate resin (PET), polystyrene (PS) and the like.

The metal reflection film can be a silver film, an aluminum film, or the like. This metal reflection film can be formed on the back surface of the resin film by a silver mirror reaction, vapor deposition, or the like. The adhesive primer layer has an adhesive property to a metal reflective film, particularly, as long as the molten resin of the resin substrate is heat-fused at the time of injection molding, and can withstand the high temperature at the time of the injection molding. Not limited. For example, a solution of an acrylate resin, an alkyd resin, an epoxy resin or an unsaturated polyester resin or the like is applied by a usual method, and dried or cured to form on the surface of the metal reflection film.

The above-mentioned functional film is not essential, but it is necessary to impart desired functions such as abrasion resistance, antifogging property, antistatic property and antireflection property to the exposed surface of the resin film mirror. Can be formed as needed. For example, when it is desired to increase the scratch resistance, a hard coating agent such as an epoxy resin, an acrylic resin, or a silicone resin is coated on the outer surface of the resin film, and then hardened by heat or ultraviolet rays. What is necessary is just to form a coat film. When it is desired to increase the anti-fogging property, a water-soluble resin-based coating agent may be coated and then cured by heat or ultraviolet rays to form an anti-fogging film.

The type of the resin of the resin substrate is not particularly limited as long as it can be injection-molded. The resin has a fluidity during injection molding, a heat-fusion property with a resin film mirror, and a resin. It can be appropriately selected in consideration of required characteristics (mechanical strength, impact resistance, heat resistance, chemical resistance, and the like). For example, polyester resins such as polycarbonate (PC) and saturated polyester resin (PBT),
It can be appropriately selected from an acrylic resin such as methyl methacrylate (PMMA), a thermoplastic resin such as a polyamide resin such as 6 nylon or 6-6 nylon, or a thermosetting resin such as an epoxy resin.

The resin base comprises a central plate and an outer peripheral frame formed on the outer peripheral edge of the central plate. The central plate and the outer peripheral frame are integrally formed by injection molding. is there. The outer shape of the center plate portion is not particularly limited, and may be, for example, an elliptical shape, a perfect circular shape, or the like, in addition to a rectangular shape such as a rectangle or a square. The front side of the plastic mirror, that is, the surface of the central plate portion on the side to which the resin film mirror is joined can be flat or curved, but the plastic mirror is a composite mirror composed of a combination of a flat mirror and a curved mirror. In order to achieve this, a composite surface of a flat surface and a concave or convex partial spherical curved surface may be used as shown in an embodiment described later.

The thickness of the central plate portion is not particularly limited and can be set as appropriate. However, it is preferable to make the thickness as thin as possible within a range in which required rigidity can be secured in order to achieve a light weight of the plastic mirror. . Here, in order to directly solve the problem of the mirror image distortion, the thickness of the central plate portion to which the resin film mirror is joined may be increased to increase the rigidity of the central plate portion. However, increasing the thickness of the central plate, which accounts for most of the plastic mirror, directly leads to weight increase, which reduces the advantage of the plastic mirror over the glass mirror, which can reduce the weight. Doing so is less meaningful. In this regard, in the present invention, since the problem of mirror image distortion can be effectively solved by forming a predetermined annular projection on the outer peripheral frame portion, in order to prevent mirror image distortion,
It is not necessary to increase the thickness of the central plate. For this reason, it is preferable to make the thickness of the central plate portion as thin as possible within a range in which rigidity originally required for the central plate portion can be secured. Specifically, it is preferably about 3 to 6 mm.

Further, the size of the central plate portion is not particularly limited and can be set as appropriate. However, there is a correlation between the size of the center plate portion and the problem of the mirror image distortion, and the larger the center plate portion, the more the problem of the mirror image distortion tends to occur. For this reason, increasing the size of the plastic mirror by enlarging the center plate portion has a certain limit in relation to the problem of mirror image distortion. In this regard, in the present invention, the problem of the mirror image distortion can be effectively solved by forming the predetermined annular projection on the outer peripheral frame portion, so that the plastic mirror is made larger than before while preventing the mirror image distortion. It is possible to

The outer peripheral frame has an annular projection integrally projecting from the center plate to the rear side of the plastic mirror. The outer peripheral frame portion can have an outer shape corresponding to the outer shape of the central plate portion. The annular protrusion protruding from the rear side of the plastic mirror protrudes from the center plate by a predetermined amount. In order to effectively prevent the center plate from being deformed by the unevenness of the mounting surface, and thus to prevent the mirror image from being distorted, the amount of protrusion of the annular protrusion is determined by the unevenness of the mounting surface. The amount is such that the outer peripheral frame portion has sufficient rigidity to effectively prevent the deformation of itself.

The width of the annular projection is preferably equal to or greater than the thickness of the central plate in order to secure the rigidity of the annular projection to a predetermined value or more. However, regarding the width of the annular projection,
Since the annular projection is formed by injection molding together with the outer peripheral frame, there is a certain molding limit. In light of this,
The width of the annular projection is preferably about 1.2 times the thickness of the central plate (the thickness can be further increased by making it hollow). If the width of the annular protrusion is too small, the rigidity of the annular protrusion becomes insufficient, and the outer peripheral frame itself tends to be deformed due to the unevenness of the mounting surface. On the other hand, if the width of the annular projection is too large, defects such as distortion and shrinkage are likely to occur due to the fluidity and cooling property of the molten resin.

A plastic mirror having such a configuration can be manufactured by injection molding a resin base while inserting a resin film mirror into a mold. That is, after forming a predetermined film on the surface of the resin film to form a resin film mirror, the molten resin of the resin substrate is placed in the mold while the resin film mirror is disposed in a predetermined injection mold. By injecting at high pressure to
A plastic mirror in which the resin film mirror and the central plate portion of the resin base are joined by heat fusion can be manufactured.

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the plastic mirror according to the present invention will be specifically described below with reference to the drawings. (Embodiment 1) The plastic mirror of this embodiment shown in FIGS. 1 and 2 includes a resin base 10 and a resin film mirror 20.

The resin film mirror 20 includes a transparent resin film 21, a metal reflection film 22 formed on the back surface of the resin film 21, and a bonding surface between the resin reflection film 22 and the resin substrate 10. It is composed of the formed adhesion primer layer 23 and the hard coat film 24 as a functional film formed on the outer surface of the resin film 21.

The resin film 21 is made of a transparent polycarbonate (PC) resin and has a thickness of 0.15 to 0.15.
1.0 mm. The metal reflection film 22 is a silver film formed on the back surface of the resin film 21 by vapor deposition. The bonding primer layer 23 is made of an alkyd resin, and is formed on the surface of the metal reflection film 22 by applying and drying a solution of this resin by a usual method. The hard coat film 24 is formed by coating the outer surface of the resin film 21 with a hard coating agent and then thermally curing the resin film 21 in order to improve the abrasion resistance of the resin film mirror 20. Become.

The resin base 10 is made of a polycarbonate (PC) resin and includes a central plate 11 and an outer peripheral frame 12 formed on the outer peripheral edge of the central plate 11. The outer peripheral frame portion 12 is integrally formed by injection molding. The central plate portion 11 has a rectangular outer shape, and its thickness (thickness in the front and back directions of the plastic mirror (up and down direction in FIG. 1)) is uniform. The outer peripheral frame portion 12 includes a central plate portion 11.
And the width thereof is uniform.

The outer frame 12 has an annular projection 13 integrally projecting behind the center plate 11 behind the plastic mirror.
have. The annular projection 13 projects beyond the center plate 11 behind the plastic mirror, and
The overall thickness (thickness of the plastic mirror in the front and back directions) is a predetermined thickness greater than the thickness of the central plate portion 11. The width of the annular protrusion 13 in the width direction of the outer peripheral frame 12 (the left-right direction of the outer peripheral frame 12 shown in FIG. 1) is
The thickness is about 1.2 times the thickness of the central plate portion 11.

The outer peripheral edge 20c of the resin film mirror 20 is formed so as to prevent the penetration of moisture and the like into the metal reflection film 22 and the like so as to effectively prevent rust of the metal reflection film 22. The frame 12 is covered with an annular covering 14 integrally formed on the inner peripheral edge. The plastic mirror of the present embodiment having the above configuration is a resin film mirror 2.
0 was inserted into a mold, and the resin base 10 was manufactured by injection molding. First, a resin film mirror 20 was prepared by forming a hard coat film 24 on one surface of a resin film 21 and forming a metal reflective film 22 and an adhesion primer layer 23 on the other surface and then cutting the resin film 21 into a predetermined shape. . Then, as shown in FIG. 3, the molten resin P of the resin base 10 is injected into the mold at a high pressure in a state where the resin film mirror 20 is disposed in a predetermined injection mold 30, thereby forming the resin mirror. A plastic mirror in which the film mirror 20 and the central plate portion 11 of the resin base 10 were bonded by heat fusion was manufactured.

Here, the injection mold 30 of the resin base 10 is used.
In the above, the first cavity mold surface 31 corresponding to the resin film mirror 20 has a concave spherical shape having an extremely large radius of curvature such that the first cavity mold surface 31 has an extremely small concave shape with its central portion as a vertex. The second cavity mold surface 32 facing the first cavity mold surface 31 and corresponding to the back surface of the central plate portion 10 has a convex spherical shape corresponding to the concave spherical shape of the first cavity mold surface 31. I have. As described above, by forming the center plate portion 10 and the resin film mirror 20 into a spherical shape such that the front side of the plastic mirror is convex, the center shape such that the front side of the plastic mirror becomes concave during injection molding. The shrinkage deformation of the plate portion 11 can be offset, so that it is possible to suppress the occurrence of distortion due to the shrinkage deformation during injection molding.

In the plastic mirror thus obtained, an adhesive 40 is applied to the back surface of the outer peripheral frame portion 12 of the resinous base 10, that is, the tip end surface of the annular projection 13, and the tip end surface of the annular projection 13 is attached to the plastic mirror. It can be used by pressing it against a mounting surface such as the inner wall surface of a house. In the plastic mirror of the present embodiment, the outer peripheral frame portion 12 which comes into contact with a mounting surface such as an inner wall surface and is provided with a pressing force at the time of mounting,
An annular projection 13 is provided on the rear side of the plastic mirror with respect to the center plate 11. The annular projection 13 has a width greater than the thickness of the center plate 11 by a predetermined amount. Therefore, the rigidity of the outer peripheral frame 12 is increased by a predetermined amount. Therefore, the outer peripheral frame portion 12 is hardly deformed due to the unevenness of the mounting surface or the thickness variation of the adhesive 40, and has a structure that is hardly deformed even when pressed with an excessive force when mounting the plastic mirror. Has become.

Moreover, since the annular projection 13 projects to the rear side of the plastic mirror, even if the annular projection 13 is slightly deformed due to the pressing force at the time of mounting or the unevenness of the mounting surface, etc. The structure is such that the influence of the deformation hardly reaches the central plate portion 11 and the resin film mirror 20. Therefore, even when the size of the plastic mirror is increased as in the present embodiment, the center plate 11 and the resin film mirror 20 are distorted due to the deformation of the outer peripheral frame 12 at the time of attachment, and the mirror image Can be effectively suppressed from being distorted.

Further, since the problem of the mirror image distortion can be solved while keeping the thickness of the central plate portion 81 occupying most of the plastic mirror as thin as possible, the weight of the plastic mirror can be reduced with respect to the glass mirror. It is possible to secure sufficient advantage. Furthermore, in addition to molding the resin base 10 by injection molding in which shrinkage is unlikely to occur, the molded shape of the central plate portion 11 and the like is formed to have a shape capable of offsetting shrinkage deformation during injection molding. The distortion of the mirror image due to the shrinkage deformation can be effectively suppressed.

(Embodiment 2) The plastic mirror according to the present embodiment shown in FIG. 4 has a plurality of nuts 51 insert-molded at the projecting tip of the annular projection 13, and other configurations are the same as those of the above-mentioned Embodiment 1. The same is true. In this embodiment, a plastic mirror is fixed to the mounting surface 60 by using bolts 50 and nuts 51 instead of using an adhesive.

By using the bolts 50 and the nuts 51 in this manner, it is possible to interpose the spacer (or shim) 52 between the mounting surface 60 and the annular projection 13.
By the presence of the spacer 52 having a constant thickness, it is possible to more reliably suppress the problem of the mirror image distortion due to the thickness variation of the adhesive or the unevenness of the mounting surface 60. Other functions and effects are the same as those of the first embodiment.

(Embodiment 3) The plastic mirror of this embodiment shown in FIG. 5 is an example in which a composite mirror composed of a combination of a plane mirror and a curved mirror is used. That is, the front side of the plastic mirror, that is, the surface of the resin film mirror 20 and the surface of the central plate portion 11 on the side to which the resin film mirror 20 is joined are flat surfaces 20a and 11a,
It comprises concave portions 20b and 11b.

In this plastic mirror, a hollow portion 13a is formed in the annular projection 13 by gas injection molding or the like. Thereby, the width of the outer shape of the annular protrusion 13 is further increased, and the annular protrusion 13 is structured to be more difficult to deform. The other configuration and operation and effect are the same as those of the first embodiment.

[0041]

As described above in detail, the plastic mirror according to the present invention has an outer peripheral frame portion provided with an annular projection projecting from the back side of the plastic mirror in the resin base. Since the rigidity of the outer peripheral frame portion is increased by increasing the thickness of the frame portion by a predetermined amount from the thickness of the central plate portion to which the resin film mirror is joined, this is a case where the size of the plastic mirror is increased. However, it is possible to effectively prevent the center plate and the resin film mirror from being distorted due to the deformation of the outer peripheral frame at the time of attachment, and hence the mirror image from being distorted.

[Brief description of the drawings]

FIG. 1 is a sectional view of a plastic mirror according to a first embodiment.

FIG. 2 is a partially enlarged cross-sectional view of a resin film mirror according to the plastic mirror of Example 1.

FIG. 3 is a cross-sectional view illustrating a state in which a resin base is injection-molded while a resin-made film mirror is inserted, according to the plastic mirror of Example 1.

FIG. 4 is a sectional view of a plastic mirror according to a second embodiment.

FIG. 5 is a sectional view of a plastic mirror according to a third embodiment.

FIG. 6 is a sectional view of a conventional plastic mirror.

[Explanation of symbols]

10: Resin base 11: Central plate 1
2: outer peripheral frame 13: annular projection 13a: hollow 20: resin film mirror 2
DESCRIPTION OF SYMBOLS 1 ... Resin film 22 ... Metal reflective film 23 ... Adhesive primer layer 24 ... Hard coat film 40 ... Adhesive 5
0: bolt 51: nut 52: spacer 6
0: Mounting surface

Claims (4)

[Claims] 1. A resin base formed by integrally molding a central plate portion and an outer peripheral frame portion formed on an outer peripheral edge of the central plate portion, and are joined to one surface of the central plate portion. A plastic mirror comprising a resin film mirror, wherein the outer peripheral frame portion has an annular projection integrally projecting from the other surface of the central plate portion to the back side of the plastic mirror. Plastic mirror. 2. The plastic mirror according to claim 1, wherein the width of the annular projection is equal to or greater than the thickness of the central plate. 3. The plastic mirror according to claim 1, wherein the annular projection has a hollow portion. 4. The plastic according to claim 1, wherein the outer peripheral frame portion has an annular covering portion that covers an outer surface of the resin film mirror at an outer peripheral edge of the resin film mirror. mirror.